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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbf4704e2263f52715fb6810627fc738a4b1c7ed68b7b4c41a991af2779d379' 
  AND token = '9bN5HGGEOuFBvHbvSin5+X9CWzwIsAHBPbLa9XpXBbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}